【创龙TL3562-MiniEVM开发板试用体验】问题2 ubuntu镜像，不能获取ip地址

在上一篇中，分析了更新ubuntu镜像后，U盘不能识别，这一篇分析下不能获取ip地址的问题

连接网线，运行命令，获取ip地址，发现报如下错误

查看/etc/udhcpc/default.script，发现原因是查看resolvconf有没有执行权限

通过确认，系统中确实没有该命令

此时有2个想法

• update.img镜像中的根文件系统有问题，是不是单独的rootfs.img镜像没有问题？
• 移植resolvconf命令？

而要想烧录rootfs.img，需要分区表，故先解压update.img得到分区表

发珊update.img解压出来的和未解压的一样

所以方法一已经失效，而移植resolvconf，不一定能解决问题，故有了方法三，即systemd方法

使用systemd系统控制，发现生成了ip地址

但不能ping通外网

重启，问题解决

总结

root@RK3562-Tronlong:~#  systemctl start systemd-resolved
root@RK3562-Tronlong:~#  systemctl start systemd-networkd
root@RK3562-Tronlong:~# [   51.993576] rk_gmac-dwmac ffb30000.ethernet eth1: PHY [stmmac-1:00] driver [YT8512H Ethernet] (irq=POLL)
[   52.203448] rk_gmac-dwmac ffb30000.ethernet: Failed to reset the dma
[   52.203460] rk_gmac-dwmac ffb30000.ethernet eth1: stmmac_hw_setup: DMA engine initialization failed
[   52.203466] rk_gmac-dwmac ffb30000.ethernet eth1: stmmac_open: Hw setup failed
[   52.656909] rk_gmac-dwmac ffa80000.ethernet eth0: PHY [stmmac-0:00] driver [YT8521SH Ethernet] (irq=POLL)
[   52.659100] dwmac4: Master AXI performs any burst length
[   52.659117] rk_gmac-dwmac ffa80000.ethernet eth0: No Safety Features support found
[   52.659130] rk_gmac-dwmac ffa80000.ethernet eth0: PTP not supported by HW
[   52.659506] rk_gmac-dwmac ffa80000.ethernet eth0: configuring for phy/rgmii-rxid link mode
[   54.685263] rk_gmac-dwmac ffa80000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx
[   54.685300] IPv6: ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready

root@RK3562-Tronlong:~# ifconfig
eth0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.12.174  netmask 255.255.255.0  broadcast 192.168.12.255
        inet6 fe80::6073:59ff:fe5b:4e9  prefixlen 64  scopeid 0x20<link>
        ether 62:73:59:5b:04:e9  txqueuelen 1000  (Ethernet)
        RX packets 31  bytes 2747 (2.7 KB)
        RX errors 0  dropped 1  overruns 0  frame 0
        TX packets 8  bytes 1208 (1.2 KB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
        device interrupt 64  

lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

root@RK3562-Tronlong:~# ping www.baidu.com
PING www.a.shifen.com (183.2.172.177) 56(84) bytes of data.
64 bytes from 183.2.172.177 (183.2.172.177): icmp_seq=1 ttl=53 time=6.90 ms
64 bytes from 183.2.172.177 (183.2.172.177): icmp_seq=2 ttl=53 time=6.60 ms

--- www.a.shifen.com ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1001ms
rtt min/avg/max/mdev = 6.604/6.749/6.895/0.145 ms

另外 systemctl start ssh.service 可以远程 登录